Sometimes knocking during shifts isn't boost related. I recently installed a Casper's knock gauge. It's not cheap (~75), but it can't be beat IMO. What I found was that the knock I have happens during the shift, while I would expect true detonation to happen just before the shift. I see it up-shift, down-shift and at different levels of boost. I'm concluding that it is a "false knock" and hoping it's cause by the engine's movement. I have a polyurethane motor mount to install and need to make sure the downpipe isn't touching anything (it likes to rest against the header).
False knock, athough not hramful to the engine, does hurt performance, because the ESC still reatrds the timing.
Listening for knock with your ears is tough. Most is not loud enough to be heard. The good news is that from what I've read from this board, at only 9 psi, these motors can tolerate a fair amount of detonation, unlike a 10-sec car running 20+psi.
Every TR should have at a minimum a boost gauge and some way to monitor knock, IMO. Scan tools are good choice, but a multi-LED gauge like Casper's is better for seeing things "real-time".
